1 /*
   2  * Copyright (c) 2009, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.nodes.calc;
  26 
  27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_2;
  28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
  29 
  30 import org.graalvm.compiler.core.common.type.ArithmeticOpTable;
  31 import org.graalvm.compiler.core.common.type.ArithmeticOpTable.UnaryOp.Neg;
  32 import org.graalvm.compiler.core.common.type.FloatStamp;
  33 import org.graalvm.compiler.core.common.type.Stamp;
  34 import org.graalvm.compiler.graph.NodeClass;
  35 import org.graalvm.compiler.graph.spi.CanonicalizerTool;
  36 import org.graalvm.compiler.lir.gen.ArithmeticLIRGeneratorTool;
  37 import org.graalvm.compiler.nodeinfo.NodeInfo;
  38 import org.graalvm.compiler.nodes.NodeView;
  39 import org.graalvm.compiler.nodes.ValueNode;
  40 import org.graalvm.compiler.nodes.spi.NodeLIRBuilderTool;
  41 import org.graalvm.compiler.nodes.spi.StampInverter;
  42 
  43 /**
  44  * The {@code NegateNode} node negates its operand.
  45  */
  46 @NodeInfo(cycles = CYCLES_2, size = SIZE_1)
  47 public final class NegateNode extends UnaryArithmeticNode<Neg> implements NarrowableArithmeticNode, StampInverter {
  48 
  49     public static final NodeClass<NegateNode> TYPE = NodeClass.create(NegateNode.class);
  50 
  51     public NegateNode(ValueNode value) {
  52         super(TYPE, ArithmeticOpTable::getNeg, value);
  53     }
  54 
  55     public static ValueNode create(ValueNode value, NodeView view) {
  56         ValueNode synonym = findSynonym(value, view);
  57         if (synonym != null) {
  58             return synonym;
  59         }
  60         return new NegateNode(value);
  61     }
  62 
  63     @Override
  64     public ValueNode canonical(CanonicalizerTool tool, ValueNode forValue) {
  65         ValueNode synonym = findSynonym(forValue, getOp(forValue));
  66         if (synonym != null) {
  67             return synonym;
  68         }
  69         return this;
  70     }
  71 
  72     protected static ValueNode findSynonym(ValueNode forValue, NodeView view) {
  73         ArithmeticOpTable.UnaryOp<Neg> negOp = ArithmeticOpTable.forStamp(forValue.stamp(view)).getNeg();
  74 
  75         // Folds constants
  76         ValueNode synonym = UnaryArithmeticNode.findSynonym(forValue, negOp);
  77         if (synonym != null) {
  78             return synonym;
  79         }
  80         if (forValue instanceof NegateNode) {
  81             return ((NegateNode) forValue).getValue();
  82         }
  83         if (forValue instanceof SubNode && !(forValue.stamp(view) instanceof FloatStamp)) {
  84             SubNode sub = (SubNode) forValue;
  85             return SubNode.create(sub.getY(), sub.getX(), view);
  86         }
  87         return null;
  88     }
  89 
  90     @Override
  91     public void generate(NodeLIRBuilderTool nodeValueMap, ArithmeticLIRGeneratorTool gen) {
  92         nodeValueMap.setResult(this, gen.emitNegate(nodeValueMap.operand(getValue())));
  93     }
  94 
  95     @Override
  96     public Stamp invertStamp(Stamp outStamp) {
  97         return getArithmeticOp().foldStamp(outStamp);
  98     }
  99 }